const fs = require("fs");
const path = require("path");
const readline = require("readline");

// 文件名
const fileName = path.join(__dirname, "../", "../", "logs", "access.log");
// 创建 read stream
const readStream = fs.createReadStream(fileName);

// 创建 readline 对象
const rl = readline.createInterface({
	input: readStream
});

let chromeNum = 0;
let sum = 0;

// 逐行读取
rl.on("line", lineData => {
	if (!lineData) {
		return;
	}

	// 记录总行数
	sum++;

	const arr = lineData.split(" -- ");
	if (arr[2] && arr[2].indexOf("Chrome") > 0) {
		// 累加 chrome 的数量
		chromeNum++;
	}
});
// 监听读取完成
rl.on("close", () => {
	console.log("chrome 占比：" + chromeNum / sum);
});
